How much system memory did the Xbox 360 include?

The Xbox 360 included 512 MB of system memory.

Microsoft equipped the Xbox 360 with 512 MB of unified GDDR3 RAM shared by the console’s central processor and graphics processor. This memory operated at 700 MHz and was designed to give developers flexible access to resources for game graphics, sound, and gameplay systems.

The unified-memory design differed from some personal computers and consoles that separated system RAM from video memory. It helped the Xbox 360’s custom hardware handle high-definition games while keeping the system architecture relatively streamlined. The console’s memory specification applied across the original Xbox 360 family, including later redesigns.

This figure is often confused with storage capacity. Hard-drive sizes varied by model and changed over the console’s life, while the 512 MB memory specification described working system memory rather than space for saved games or downloads.